parasitism, relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism. The plant ailment known as Dutch elm disease (caused by the fungus Ceratocystis ulmi) can be spread by the European elm bark beetle.
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parasitism, relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism. The plant ailment known as Dutch elm disease (caused by the fungus Ceratocystis ulmi) can be spread by the European elm bark beetle.